Study On Stability Characteristics Of Sliding Slope With Multi-sliding Surface Multi-stage Protection

Highways are an indispensable important infrastructure for national economic construction and national defense construction.They are the link connecting the local economies.In recent years,the focus of road construction has gradually turned to the west.The terrain conditions in the western region are complex,and the mountain gullies are vertical and horizontal.When the road passes through the high slope,it is necessary to consider its safety.For the slope with poor safety,multi-level protection is required.The article first summarizes and summarizes the development history and research methods of slope stability,analyzes the stability factors affecting the slope and common failure modes;then introduces the application of finite element in slope analysis;then uses Midas/GTS limited The meta-software studied the stability of the five-level slope and the selection of the bolt parameters for the protection of the five-level slope by the anchor lattice beam,and the selection of the slope protection sequence.The specific research contents are as follows:(1)Using the finite element software to establish a single-stage slope model,calculate the influence of cohesion,internal friction angle and elastic modulus on the slope stability.It is concluded that the slope is stable with the increase of cohesion and internal friction angle.The better the property,the elastic modulus has little effect on the stability of the slope;the relationship between the position of the sliding surface of the secondary slope model and the soil material parameters is obtained: the secondary slope model with the c and ? changing,the change in the sliding surface will also change.(2)Using Midas/GTS software,establish a two-layer soil five-level slope model,use the finite element numerical calculation method,and use the strength reduction method to calculate whether the five-level slope model is stable;using the unstable five-level slope,the anchor lattice beam is reinforced to obtain: the optimal anchoring length of the anchor is not less than 7m,the anchoring inclination is 20°~30°,and the anchoring spacing is not less than 2.5m.(3)In the protection of the five-level slope,after determining the parameters of the protective bolt,the construction process is simulated,and it is concluded that in the protection process of the multi-level slope,it is not necessary to follow the protection process from bottom to top.The protection of the middle position of the slope can be carried out first,followed by the protection of the position above or below the middle part,then the protection of the slope of the whole slope body,and finally the protection of the remaining position.(4)Carry out stability analysis and verification for a specific landslide project,and use the anti-slide pile + retaining wall and anchor lattice beam + retaining wall to strengthen the simulation of the unstable slope.